/* eslint-disable */
// LegacyGLTFLoader for loading gltf 1.0 files taken from THREE v110 because it was removed in THREE v111 and maintained
// since
import * as THREE from 'three';
const threeExamples = {};
/**
 * @author Rich Tibbett / https://github.com/richtr
 * @author mrdoob / http://mrdoob.com/
 * @author Tony Parisi / http://www.tonyparisi.com/
 * @author Takahiro / https://github.com/takahirox
 */

threeExamples.LegacyGLTFLoader = ( function () {

    class LegacyGLTFLoader extends THREE.Loader {
        constructor ( manager ) {
            super(manager);
        }

        load( url, onLoad, onProgress, onError ) {

            var scope = this;

            var resourcePath;

            if ( this.resourcePath !== '' ) {

                resourcePath = this.resourcePath;

            } else if ( this.path !== '' ) {

                resourcePath = this.path;

            } else {

                resourcePath = THREE.LoaderUtils.extractUrlBase( url );

            }

            var loader = new THREE.FileLoader( scope.manager );

            loader.setPath( this.path );
            loader.setResponseType( 'arraybuffer' );

            loader.load( url, function ( data ) {

                scope.parse( data, resourcePath, onLoad );

            }, onProgress, onError );

        }

        parse ( data, path, callback ) {
            var content;
            var extensions = {};

            var magic = THREE.LoaderUtils.decodeText( new Uint8Array( data, 0, 4 ) );

            if ( magic === BINARY_EXTENSION_HEADER_DEFAULTS.magic ) {

                extensions[ EXTENSIONS.KHR_BINARY_GLTF ] = new GLTFBinaryExtension( data );
                content = extensions[ EXTENSIONS.KHR_BINARY_GLTF ].content;

            } else {

                content = THREE.LoaderUtils.decodeText( new Uint8Array( data ) );

            }

            var json = JSON.parse( content );

            if ( json.extensionsUsed && json.extensionsUsed.indexOf( EXTENSIONS.KHR_MATERIALS_COMMON ) >= 0 ) {

                extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ] = new GLTFMaterialsCommonExtension( json );

            }

            if ( json.extensionsUsed && json.extensionsUsed.indexOf( EXTENSIONS.CESIUM_RTC ) >= 0 ) {

                extensions[ EXTENSIONS.CESIUM_RTC ] = new CesiumRTCExtension( json );

            }

            var parser = new GLTFParser( json, extensions, {

                crossOrigin: this.crossOrigin,
                manager: this.manager,
                path: path || this.resourcePath || ''

            } );

            parser.parse( function ( scene, scenes, cameras, animations ) {

                var glTF = {
                    "scene": scene,
                    "scenes": scenes,
                    "cameras": cameras,
                    "animations": animations
                };

                callback( glTF );

            } );

        }
    }

    /* GLTFREGISTRY */

    function GLTFRegistry() {

        var objects = {};

        return	{

            get: function ( key ) {

                return objects[ key ];

            },

            add: function ( key, object ) {

                objects[ key ] = object;

            },

            remove: function ( key ) {

                delete objects[ key ];

            },

            removeAll: function () {

                objects = {};

            },

            update: function ( scene, camera ) {

                for ( var name in objects ) {

                    var object = objects[ name ];

                    if ( object.update ) {

                        object.update( scene, camera );

                    }

                }

            }

        };

    }

    /* GLTFSHADERS */

    LegacyGLTFLoader.Shaders = {

        update: function () {

            console.warn( 'threeExamples.LegacyGLTFLoader.Shaders has been deprecated, and now updates automatically.' );

        }

    };

    /* GLTFSHADER */

    function GLTFShader( targetNode, allNodes ) {

        var boundUniforms = {};

        // bind each uniform to its source node

        var uniforms = targetNode.material.uniforms;

        for ( var uniformId in uniforms ) {

            var uniform = uniforms[ uniformId ];

            if ( uniform.semantic ) {

                var sourceNodeRef = uniform.node;

                var sourceNode = targetNode;

                if ( sourceNodeRef ) {

                    sourceNode = allNodes[ sourceNodeRef ];

                }

                boundUniforms[ uniformId ] = {
                    semantic: uniform.semantic,
                    sourceNode: sourceNode,
                    targetNode: targetNode,
                    uniform: uniform
                };

            }

        }

        this.boundUniforms = boundUniforms;
        this._m4 = new THREE.Matrix4();

    }

    // Update - update all the uniform values
    GLTFShader.prototype.update = function ( scene, camera ) {

        var boundUniforms = this.boundUniforms;

        for ( var name in boundUniforms ) {

            var boundUniform = boundUniforms[ name ];

            switch ( boundUniform.semantic ) {

                case "MODELVIEW":

                    var m4 = boundUniform.uniform.value;
                    m4.multiplyMatrices( camera.matrixWorldInverse, boundUniform.sourceNode.matrixWorld );
                    break;

                case "MODELVIEWINVERSETRANSPOSE":

                    var m3 = boundUniform.uniform.value;
                    this._m4.multiplyMatrices( camera.matrixWorldInverse, boundUniform.sourceNode.matrixWorld );
                    m3.getNormalMatrix( this._m4 );
                    break;

                case "PROJECTION":

                    var m4 = boundUniform.uniform.value;
                    m4.copy( camera.projectionMatrix );
                    break;

                case "JOINTMATRIX":

                    var m4v = boundUniform.uniform.value;

                    for ( var mi = 0; mi < m4v.length; mi ++ ) {

                        // So it goes like this:
                        // SkinnedMesh world matrix is already baked into MODELVIEW;
                        // transform joints to local space,
                        // then transform using joint's inverse
                        m4v[ mi ]
                            .getInverse( boundUniform.sourceNode.matrixWorld )
                            .multiply( boundUniform.targetNode.skeleton.bones[ mi ].matrixWorld )
                            .multiply( boundUniform.targetNode.skeleton.boneInverses[ mi ] )
                            .multiply( boundUniform.targetNode.bindMatrix );

                    }

                    break;

                default :

                    console.warn( "Unhandled shader semantic: " + boundUniform.semantic );
                    break;

            }

        }

    };


    /* ANIMATION */

    LegacyGLTFLoader.Animations = {

        update: function () {

            console.warn( 'threeExamples.LegacyGLTFLoader.Animation has been deprecated. Use THREE.AnimationMixer instead.' );

        }

    };

    /*********************************/
    /********** EXTENSIONS ***********/
    /*********************************/

    var EXTENSIONS = {
        KHR_BINARY_GLTF: 'KHR_binary_glTF',
        KHR_MATERIALS_COMMON: 'KHR_materials_common',
        CESIUM_RTC: 'CESIUM_RTC'
    };

    /* MATERIALS COMMON EXTENSION */

    function GLTFMaterialsCommonExtension( json ) {

        this.name = EXTENSIONS.KHR_MATERIALS_COMMON;

        this.lights = {};

        var extension = ( json.extensions && json.extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ] ) || {};
        var lights = extension.lights || {};

        for ( var lightId in lights ) {

            var light = lights[ lightId ];
            var lightNode;

            var lightParams = light[ light.type ];
            var color = new THREE.Color().fromArray( lightParams.color );

            switch ( light.type ) {

                case "directional":
                    lightNode = new THREE.DirectionalLight( color );
                    lightNode.position.set( 0, 0, 1 );
                    break;

                case "point":
                    lightNode = new THREE.PointLight( color );
                    break;

                case "spot":
                    lightNode = new THREE.SpotLight( color );
                    lightNode.position.set( 0, 0, 1 );
                    break;

                case "ambient":
                    lightNode = new THREE.AmbientLight( color );
                    break;

            }

            if ( lightNode ) {

                this.lights[ lightId ] = lightNode;

            }

        }

    }

    /* BINARY EXTENSION */

    var BINARY_EXTENSION_BUFFER_NAME = 'binary_glTF';

    var BINARY_EXTENSION_HEADER_DEFAULTS = { magic: 'glTF', version: 1, contentFormat: 0 };

    var BINARY_EXTENSION_HEADER_LENGTH = 20;

    function GLTFBinaryExtension( data ) {

        this.name = EXTENSIONS.KHR_BINARY_GLTF;

        var headerView = new DataView( data, 0, BINARY_EXTENSION_HEADER_LENGTH );

        var header = {
            magic: THREE.LoaderUtils.decodeText( new Uint8Array( data.slice( 0, 4 ) ) ),
            version: headerView.getUint32( 4, true ),
            length: headerView.getUint32( 8, true ),
            contentLength: headerView.getUint32( 12, true ),
            contentFormat: headerView.getUint32( 16, true )
        };

        for ( var key in BINARY_EXTENSION_HEADER_DEFAULTS ) {

            var value = BINARY_EXTENSION_HEADER_DEFAULTS[ key ];

            if ( header[ key ] !== value ) {

                throw new Error( 'Unsupported glTF-Binary header: Expected "%s" to be "%s".', key, value );

            }

        }

        var contentArray = new Uint8Array( data, BINARY_EXTENSION_HEADER_LENGTH, header.contentLength );

        this.header = header;
        this.content = THREE.LoaderUtils.decodeText( contentArray );
        this.body = data.slice( BINARY_EXTENSION_HEADER_LENGTH + header.contentLength, header.length );

    }

    GLTFBinaryExtension.prototype.loadShader = function ( shader, bufferViews ) {

        var bufferView = bufferViews[ shader.extensions[ EXTENSIONS.KHR_BINARY_GLTF ].bufferView ];
        var array = new Uint8Array( bufferView );

        return THREE.LoaderUtils.decodeText( array );

    };

    // Ref spec https://github.com/KhronosGroup/glTF/blob/main/extensions/1.0/Vendor/CESIUM_RTC/README.md
    // Only the json storage method is implemented since it is the only one we've seen out there and since this extension
    // is specific to deprecated 3D tiles with GLTF 1.0
    function CesiumRTCExtension( json ) {
        this.name = EXTENSIONS.CESIUM_RTC;

        this.center = [0, 0, 0];

        if ( json.extensions &&
            json.extensions[ EXTENSIONS.CESIUM_RTC ] &&
            json.extensions[ EXTENSIONS.CESIUM_RTC ].center &&
            json.extensions[ EXTENSIONS.CESIUM_RTC ].center.length === 3) {
            this.center = json.extensions[ EXTENSIONS.CESIUM_RTC ].center;
        }
    }

    /*********************************/
    /********** INTERNALS ************/
    /*********************************/

    /* CONSTANTS */

    var WEBGL_CONSTANTS = {
        FLOAT: 5126,
        //FLOAT_MAT2: 35674,
        FLOAT_MAT3: 35675,
        FLOAT_MAT4: 35676,
        FLOAT_VEC2: 35664,
        FLOAT_VEC3: 35665,
        FLOAT_VEC4: 35666,
        LINEAR: 9729,
        REPEAT: 10497,
        SAMPLER_2D: 35678,
        TRIANGLES: 4,
        LINES: 1,
        UNSIGNED_BYTE: 5121,
        UNSIGNED_SHORT: 5123,

        VERTEX_SHADER: 35633,
        FRAGMENT_SHADER: 35632
    };

    var WEBGL_TYPE = {
        5126: Number,
        //35674: THREE.Matrix2,
        35675: THREE.Matrix3,
        35676: THREE.Matrix4,
        35664: THREE.Vector2,
        35665: THREE.Vector3,
        35666: THREE.Vector4,
        35678: THREE.Texture
    };

    var WEBGL_COMPONENT_TYPES = {
        5120: Int8Array,
        5121: Uint8Array,
        5122: Int16Array,
        5123: Uint16Array,
        5125: Uint32Array,
        5126: Float32Array
    };

    var WEBGL_FILTERS = {
        9728: THREE.NearestFilter,
        9729: THREE.LinearFilter,
        9984: THREE.NearestMipmapNearestFilter,
        9985: THREE.LinearMipmapNearestFilter,
        9986: THREE.NearestMipmapLinearFilter,
        9987: THREE.LinearMipmapLinearFilter
    };

    var WEBGL_WRAPPINGS = {
        33071: THREE.ClampToEdgeWrapping,
        33648: THREE.MirroredRepeatWrapping,
        10497: THREE.RepeatWrapping
    };

    var WEBGL_TEXTURE_FORMATS = {
        6406: THREE.AlphaFormat,
        6407: THREE.RGBAFormat,
        6408: THREE.RGBAFormat,
        6409: THREE.LuminanceFormat,
        6410: THREE.LuminanceAlphaFormat
    };

    var WEBGL_TEXTURE_DATATYPES = {
        5121: THREE.UnsignedByteType,
        32819: THREE.UnsignedShort4444Type,
        32820: THREE.UnsignedShort5551Type,
        33635: THREE.UnsignedShort5551Type
    };

    var WEBGL_SIDES = {
        1028: THREE.BackSide, // Culling front
        1029: THREE.FrontSide // Culling back
        //1032: THREE.NoSide   // Culling front and back, what to do?
    };

    var WEBGL_DEPTH_FUNCS = {
        512: THREE.NeverDepth,
        513: THREE.LessDepth,
        514: THREE.EqualDepth,
        515: THREE.LessEqualDepth,
        516: THREE.GreaterEqualDepth,
        517: THREE.NotEqualDepth,
        518: THREE.GreaterEqualDepth,
        519: THREE.AlwaysDepth
    };

    var WEBGL_BLEND_EQUATIONS = {
        32774: THREE.AddEquation,
        32778: THREE.SubtractEquation,
        32779: THREE.ReverseSubtractEquation
    };

    var WEBGL_BLEND_FUNCS = {
        0: THREE.ZeroFactor,
        1: THREE.OneFactor,
        768: THREE.SrcColorFactor,
        769: THREE.OneMinusSrcColorFactor,
        770: THREE.SrcAlphaFactor,
        771: THREE.OneMinusSrcAlphaFactor,
        772: THREE.DstAlphaFactor,
        773: THREE.OneMinusDstAlphaFactor,
        774: THREE.DstColorFactor,
        775: THREE.OneMinusDstColorFactor,
        776: THREE.SrcAlphaSaturateFactor
        // The followings are not supported by Three.js yet
        //32769: CONSTANT_COLOR,
        //32770: ONE_MINUS_CONSTANT_COLOR,
        //32771: CONSTANT_ALPHA,
        //32772: ONE_MINUS_CONSTANT_COLOR
    };

    var WEBGL_TYPE_SIZES = {
        'SCALAR': 1,
        'VEC2': 2,
        'VEC3': 3,
        'VEC4': 4,
        'MAT2': 4,
        'MAT3': 9,
        'MAT4': 16
    };

    var PATH_PROPERTIES = {
        scale: 'scale',
        translation: 'position',
        rotation: 'quaternion'
    };

    var INTERPOLATION = {
        LINEAR: THREE.InterpolateLinear,
        STEP: THREE.InterpolateDiscrete
    };

    var STATES_ENABLES = {
        2884: 'CULL_FACE',
        2929: 'DEPTH_TEST',
        3042: 'BLEND',
        3089: 'SCISSOR_TEST',
        32823: 'POLYGON_OFFSET_FILL',
        32926: 'SAMPLE_ALPHA_TO_COVERAGE'
    };

    /* UTILITY FUNCTIONS */

    function _each( object, callback, thisObj ) {

        if ( ! object ) {

            return Promise.resolve();

        }

        var results;
        var fns = [];

        if ( Object.prototype.toString.call( object ) === '[object Array]' ) {

            results = [];

            var length = object.length;

            for ( var idx = 0; idx < length; idx ++ ) {

                var value = callback.call( thisObj || this, object[ idx ], idx );

                if ( value ) {

                    fns.push( value );

                    if ( value instanceof Promise ) {

                        value.then( function ( key, value ) {

                            results[ key ] = value;

                        }.bind( this, idx ) );

                    } else {

                        results[ idx ] = value;

                    }

                }

            }

        } else {

            results = {};

            for ( var key in object ) {

                if ( object.hasOwnProperty( key ) ) {

                    var value = callback.call( thisObj || this, object[ key ], key );

                    if ( value ) {

                        fns.push( value );

                        if ( value instanceof Promise ) {

                            value.then( function ( key, value ) {

                                results[ key ] = value;

                            }.bind( this, key ) );

                        } else {

                            results[ key ] = value;

                        }

                    }

                }

            }

        }

        return Promise.all( fns ).then( function () {

            return results;

        } );

    }

    function resolveURL( url, path ) {

        // Invalid URL
        if ( typeof url !== 'string' || url === '' )
            return '';

        // Absolute URL http://,https://,//
        if ( /^(https?:)?\/\//i.test( url ) ) {

            return url;

        }

        // Data URI
        if ( /^data:.*,.*$/i.test( url ) ) {

            return url;

        }

        // Blob URL
        if ( /^blob:.*$/i.test( url ) ) {

            return url;

        }

        // Relative URL
        return ( path || '' ) + url;

    }

    // Three.js seems too dependent on attribute names so globally
    // replace those in the shader code
    function replaceTHREEShaderAttributes( shaderText, technique ) {

        // Expected technique attributes
        var attributes = {};

        for ( var attributeId in technique.attributes ) {

            var pname = technique.attributes[ attributeId ];

            var param = technique.parameters[ pname ];
            var atype = param.type;
            var semantic = param.semantic;

            attributes[ attributeId ] = {
                type: atype,
                semantic: semantic
            };

        }

        // Figure out which attributes to change in technique

        var shaderParams = technique.parameters;
        var shaderAttributes = technique.attributes;
        var params = {};

        for ( var attributeId in attributes ) {

            var pname = shaderAttributes[ attributeId ];
            var shaderParam = shaderParams[ pname ];
            var semantic = shaderParam.semantic;
            if ( semantic ) {

                params[ attributeId ] = shaderParam;

            }

        }

        for ( var pname in params ) {

            var param = params[ pname ];
            var semantic = param.semantic;

            var regEx = new RegExp( "\\b" + pname + "\\b", "g" );

            switch ( semantic ) {

                case "POSITION":

                    shaderText = shaderText.replace( regEx, 'position' );
                    break;

                case "NORMAL":

                    shaderText = shaderText.replace( regEx, 'normal' );
                    break;

                case 'TEXCOORD_0':
                case 'TEXCOORD0':
                case 'TEXCOORD':

                    shaderText = shaderText.replace( regEx, 'uv' );
                    break;

                case 'TEXCOORD_1':

                    shaderText = shaderText.replace( regEx, 'uv2' );
                    break;

                case 'COLOR_0':
                case 'COLOR0':
                case 'COLOR':

                    shaderText = shaderText.replace( regEx, 'color' );
                    break;

                case "WEIGHT":

                    shaderText = shaderText.replace( regEx, 'skinWeight' );
                    break;

                case "JOINT":

                    shaderText = shaderText.replace( regEx, 'skinIndex' );
                    break;

            }

        }

        return shaderText;

    }

    function createDefaultMaterial() {

        return new THREE.MeshPhongMaterial( {
            color: 0x00000,
            emissive: 0x888888,
            specular: 0x000000,
            shininess: 0,
            transparent: false,
            depthTest: true,
            side: THREE.FrontSide
        } );

    }

    /**
     * Verifies if the shaders are Cesium specific: if they contain attributes, uniforms or functions starting with
     * `czm_`. The cesium gltf-pipeline (the ancestor of cesium ion) used to create 3D Tiles tilesets they are only
     * defined in Cesium.
     * @param {Object} shaders
     */
    function areShadersCesiumSpecific(shaders) {
        for (const shaderId in shaders) {
            if (shaders[shaderId].includes('czm_')) {
                return true;
            }
        }
        return false;
    }

    // Deferred constructor for RawShaderMaterial types
    function DeferredShaderMaterial( params ) {

        this.isDeferredShaderMaterial = true;

        this.params = params;

    }

    DeferredShaderMaterial.prototype.create = function () {

        var uniforms = THREE.UniformsUtils.clone( this.params.uniforms );

        for ( var uniformId in this.params.uniforms ) {

            var originalUniform = this.params.uniforms[ uniformId ];

            if ( originalUniform.value instanceof THREE.Texture ) {

                uniforms[ uniformId ].value = originalUniform.value;
                uniforms[ uniformId ].value.needsUpdate = true;

            }

            uniforms[ uniformId ].semantic = originalUniform.semantic;
            uniforms[ uniformId ].node = originalUniform.node;

        }

        this.params.uniforms = uniforms;

        return new THREE.RawShaderMaterial( this.params );

    };

    /* GLTF PARSER */

    function GLTFParser( json, extensions, options ) {

        this.json = json || {};
        this.extensions = extensions || {};
        this.options = options || {};

        // loader object cache
        this.cache = new GLTFRegistry();

    }

    GLTFParser.prototype._withDependencies = function ( dependencies ) {

        var _dependencies = {};

        for ( var i = 0; i < dependencies.length; i ++ ) {

            var dependency = dependencies[ i ];
            var fnName = "load" + dependency.charAt( 0 ).toUpperCase() + dependency.slice( 1 );

            var cached = this.cache.get( dependency );

            if ( cached !== undefined ) {

                _dependencies[ dependency ] = cached;

            } else if ( this[ fnName ] ) {

                var fn = this[ fnName ]();
                this.cache.add( dependency, fn );

                _dependencies[ dependency ] = fn;

            }

        }

        return _each( _dependencies, function ( dependency ) {

            return dependency;

        } );

    };

    GLTFParser.prototype.parse = function ( callback ) {

        var json = this.json;

        // Clear the loader cache
        this.cache.removeAll();

        // Fire the callback on complete
        this._withDependencies( [

            "scenes",
            "cameras",
            "animations"

        ] ).then( function ( dependencies ) {

            var scenes = [];

            for ( var name in dependencies.scenes ) {

                scenes.push( dependencies.scenes[ name ] );

            }

            var scene = json.scene !== undefined ? dependencies.scenes[ json.scene ] : scenes[ 0 ];

            var cameras = [];

            for ( var name in dependencies.cameras ) {

                var camera = dependencies.cameras[ name ];
                cameras.push( camera );

            }

            var animations = [];

            for ( var name in dependencies.animations ) {

                animations.push( dependencies.animations[ name ] );

            }

            callback( scene, scenes, cameras, animations );

        } );

    };

    GLTFParser.prototype.loadShaders = function () {

        var json = this.json;
        var extensions = this.extensions;
        var options = this.options;

        return this._withDependencies( [

            "bufferViews"

        ] ).then( function ( dependencies ) {

            return _each( json.shaders, function ( shader ) {

                if ( shader.extensions && shader.extensions[ EXTENSIONS.KHR_BINARY_GLTF ] ) {

                    return extensions[ EXTENSIONS.KHR_BINARY_GLTF ].loadShader( shader, dependencies.bufferViews );

                }

                return new Promise( function ( resolve ) {

                    var loader = new THREE.FileLoader( options.manager );
                    loader.setResponseType( 'text' );
                    loader.load( resolveURL( shader.uri, options.path ), function ( shaderText ) {

                        resolve( shaderText );

                    } );

                } );

            } );

        } );

    };

    GLTFParser.prototype.loadBuffers = function () {

        var json = this.json;
        var extensions = this.extensions;
        var options = this.options;

        return _each( json.buffers, function ( buffer, name ) {

            if ( name === BINARY_EXTENSION_BUFFER_NAME || name === EXTENSIONS.KHR_BINARY_GLTF) {

                return extensions[ EXTENSIONS.KHR_BINARY_GLTF ].body;

            }

            if ( buffer.type === 'arraybuffer' || buffer.type === undefined ) {

                return new Promise( function ( resolve ) {

                    var loader = new THREE.FileLoader( options.manager );
                    loader.setResponseType( 'arraybuffer' );
                    loader.load( resolveURL( buffer.uri, options.path ), function ( buffer ) {

                        resolve( buffer );

                    } );

                } );

            } else {

                console.warn( 'threeExamples.LegacyGLTFLoader: ' + buffer.type + ' buffer type is not supported' );

            }

        } );

    };

    GLTFParser.prototype.loadBufferViews = function () {

        var json = this.json;

        return this._withDependencies( [

            "buffers"

        ] ).then( function ( dependencies ) {

            return _each( json.bufferViews, function ( bufferView ) {

                var arraybuffer = dependencies.buffers[ bufferView.buffer ];

                var byteLength = bufferView.byteLength !== undefined ? bufferView.byteLength : 0;

                return arraybuffer.slice( bufferView.byteOffset, bufferView.byteOffset + byteLength );

            } );

        } );

    };

    GLTFParser.prototype.loadAccessors = function () {

        var json = this.json;

        return this._withDependencies( [

            "bufferViews"

        ] ).then( function ( dependencies ) {

            return _each( json.accessors, function ( accessor ) {

                var arraybuffer = dependencies.bufferViews[ accessor.bufferView ];
                var itemSize = WEBGL_TYPE_SIZES[ accessor.type ];
                var TypedArray = WEBGL_COMPONENT_TYPES[ accessor.componentType ];

                // For VEC3: itemSize is 3, elementBytes is 4, itemBytes is 12.
                var elementBytes = TypedArray.BYTES_PER_ELEMENT;
                var itemBytes = elementBytes * itemSize;

                // The buffer is not interleaved if the stride is the item size in bytes.
                if ( accessor.byteStride && accessor.byteStride !== itemBytes ) {

                    // Use the full buffer if it's interleaved.
                    var array = new TypedArray( arraybuffer );

                    // Integer parameters to IB/IBA are in array elements, not bytes.
                    var ib = new THREE.InterleavedBuffer( array, accessor.byteStride / elementBytes );

                    return new THREE.InterleavedBufferAttribute( ib, itemSize, accessor.byteOffset / elementBytes );

                } else {

                    array = new TypedArray( arraybuffer, accessor.byteOffset, accessor.count * itemSize );

                    return new THREE.BufferAttribute( array, itemSize );

                }

            } );

        } );

    };

    GLTFParser.prototype.loadTextures = function () {

        var json = this.json;
        var options = this.options;

        return this._withDependencies( [

            "bufferViews"

        ] ).then( function ( dependencies ) {

            return _each( json.textures, function ( texture ) {

                if ( texture.source ) {

                    return new Promise( function ( resolve ) {

                        var source = json.images[ texture.source ];
                        var sourceUri = source.uri;
                        var isObjectURL = false;

                        if ( source.extensions && source.extensions[ EXTENSIONS.KHR_BINARY_GLTF ] ) {

                            var metadata = source.extensions[ EXTENSIONS.KHR_BINARY_GLTF ];
                            var bufferView = dependencies.bufferViews[ metadata.bufferView ];
                            var blob = new Blob( [ bufferView ], { type: metadata.mimeType } );
                            sourceUri = URL.createObjectURL( blob );
                            isObjectURL = true;

                        }

                        var textureLoader = options.manager.getHandler( sourceUri );

                        if ( textureLoader === null ) {

                            textureLoader = new THREE.TextureLoader( options.manager );

                        }

                        textureLoader.setCrossOrigin( options.crossOrigin );

                        textureLoader.load( resolveURL( sourceUri, options.path ), function ( _texture ) {

                            if ( isObjectURL ) URL.revokeObjectURL( sourceUri );

                            _texture.flipY = false;

                            if ( texture.name !== undefined ) _texture.name = texture.name;

                            _texture.format = texture.format !== undefined ? WEBGL_TEXTURE_FORMATS[ texture.format ] : THREE.RGBAFormat;

                            if ( texture.internalFormat !== undefined && _texture.format !== WEBGL_TEXTURE_FORMATS[ texture.internalFormat ] ) {

                                console.warn( 'threeExamples.LegacyGLTFLoader: Three.js doesn\'t support texture internalFormat which is different from texture format. ' +
                                    'internalFormat will be forced to be the same value as format.' );

                            }

                            _texture.type = texture.type !== undefined ? WEBGL_TEXTURE_DATATYPES[ texture.type ] : THREE.UnsignedByteType;

                            if ( texture.sampler ) {

                                var sampler = json.samplers[ texture.sampler ];

                                _texture.magFilter = WEBGL_FILTERS[ sampler.magFilter ] || THREE.LinearFilter;
                                _texture.minFilter = WEBGL_FILTERS[ sampler.minFilter ] || THREE.NearestMipmapLinearFilter;
                                _texture.wrapS = WEBGL_WRAPPINGS[ sampler.wrapS ] || THREE.RepeatWrapping;
                                _texture.wrapT = WEBGL_WRAPPINGS[ sampler.wrapT ] || THREE.RepeatWrapping;

                            }

                            resolve( _texture );

                        }, undefined, function () {

                            if ( isObjectURL ) URL.revokeObjectURL( sourceUri );

                            resolve();

                        } );

                    } );

                }

            } );

        } );

    };

    GLTFParser.prototype.loadMaterials = function () {

        var json = this.json;

        return this._withDependencies( [

            "shaders",
            "textures"

        ] ).then( function ( dependencies ) {

            return _each( json.materials, function ( material ) {

                var materialType;
                var materialValues = {};
                var materialParams = {};

                var khr_material;

                if ( material.extensions && material.extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ] ) {

                    khr_material = material.extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ];

                }

                if ( khr_material ) {

                    // don't copy over unused values to avoid material warning spam
                    var keys = [ 'ambient', 'emission', 'transparent', 'transparency', 'doubleSided' ];

                    switch ( khr_material.technique ) {

                        case 'BLINN' :
                        case 'PHONG' :
                            materialType = THREE.MeshPhongMaterial;
                            keys.push( 'diffuse', 'specular', 'shininess' );
                            break;

                        case 'LAMBERT' :
                            materialType = THREE.MeshLambertMaterial;
                            keys.push( 'diffuse' );
                            break;

                        case 'CONSTANT' :
                        default :
                            materialType = THREE.MeshBasicMaterial;
                            break;

                    }

                    keys.forEach( function ( v ) {

                        if ( khr_material.values[ v ] !== undefined ) materialValues[ v ] = khr_material.values[ v ];

                    } );

                    if ( khr_material.doubleSided || materialValues.doubleSided ) {

                        materialParams.side = THREE.DoubleSide;

                    }

                    if ( khr_material.transparent || materialValues.transparent ) {

                        materialParams.transparent = true;
                        materialParams.opacity = ( materialValues.transparency !== undefined ) ? materialValues.transparency : 1;

                    }

                } else if ( material.technique === undefined ) {

                    materialType = THREE.MeshPhongMaterial;

                    Object.assign( materialValues, material.values );

                } else {

                    const technique = json.techniques[ material.technique ];

                    // If shaders are Cesium specific, set up a MeshBasicMaterial to avoid an error at shader compilation
                    if (areShadersCesiumSpecific(dependencies.shaders)) {

                        materialType = THREE.MeshBasicMaterial;

                        // Retrieve texture from uniforms so it is not lost in the process.
                        let texture = null;
                        const uniforms = technique.uniforms;

                        for ( const uniformId in uniforms ) {

                            const pname = uniforms[uniformId];
                            const shaderParam = technique.parameters[pname];
                            const ptype = shaderParam.type;

                            if (ptype === WEBGL_CONSTANTS.SAMPLER_2D) {
                                let value;
                                if (material.values !== undefined) value = material.values[pname];
                                if (value !== undefined) {
                                    texture = dependencies.textures[value];
                                } else if (shaderParam.value !== undefined) {
                                    texture = dependencies.textures[shaderParam.value];
                                }
                            }
                        }

                        if (texture) {
                            materialParams.map = texture;
                        }

                    } else {

                        materialType = DeferredShaderMaterial;

                        materialParams.uniforms = {};

                        var program = json.programs[ technique.program ];

                        if ( program ) {

                            materialParams.fragmentShader = dependencies.shaders[ program.fragmentShader ];

                            if ( ! materialParams.fragmentShader ) {

                                console.warn( "ERROR: Missing fragment shader definition:", program.fragmentShader );
                                materialType = THREE.MeshPhongMaterial;

                            }

                            var vertexShader = dependencies.shaders[ program.vertexShader ];

                            if ( ! vertexShader ) {

                                console.warn( "ERROR: Missing vertex shader definition:", program.vertexShader );
                                materialType = THREE.MeshPhongMaterial;

                            }

                            // IMPORTANT: FIX VERTEX SHADER ATTRIBUTE DEFINITIONS
                            materialParams.vertexShader = replaceTHREEShaderAttributes( vertexShader, technique );

                            const uniforms = technique.uniforms;

                            for ( const uniformId in uniforms ) {

                                const pname = uniforms[ uniformId ];
                                const shaderParam = technique.parameters[ pname ];

                                const ptype = shaderParam.type;

                                if ( WEBGL_TYPE[ ptype ] ) {

                                    const pcount = shaderParam.count;
                                    let value;

                                    if ( material.values !== undefined ) value = material.values[ pname ];

                                    var uvalue = new WEBGL_TYPE[ ptype ]();
                                    var usemantic = shaderParam.semantic;
                                    var unode = shaderParam.node;

                                    switch ( ptype ) {

                                        case WEBGL_CONSTANTS.FLOAT:

                                            uvalue = shaderParam.value;

                                            if ( pname == "transparency" ) {

                                                materialParams.transparent = true;

                                            }

                                            if ( value !== undefined ) {

                                                uvalue = value;

                                            }

                                            break;

                                        case WEBGL_CONSTANTS.FLOAT_VEC2:
                                        case WEBGL_CONSTANTS.FLOAT_VEC3:
                                        case WEBGL_CONSTANTS.FLOAT_VEC4:
                                        case WEBGL_CONSTANTS.FLOAT_MAT3:

                                            if ( shaderParam && shaderParam.value ) {

                                                uvalue.fromArray( shaderParam.value );

                                            }

                                            if ( value ) {

                                                uvalue.fromArray( value );

                                            }

                                            break;

                                        case WEBGL_CONSTANTS.FLOAT_MAT2:

                                            // what to do?
                                            console.warn( "FLOAT_MAT2 is not a supported uniform type" );
                                            break;

                                        case WEBGL_CONSTANTS.FLOAT_MAT4:

                                            if ( pcount ) {

                                                uvalue = new Array( pcount );

                                                for ( var mi = 0; mi < pcount; mi ++ ) {

                                                    uvalue[ mi ] = new WEBGL_TYPE[ ptype ]();

                                                }

                                                if ( shaderParam && shaderParam.value ) {

                                                    var m4v = shaderParam.value;
                                                    uvalue.fromArray( m4v );

                                                }

                                                if ( value ) {

                                                    uvalue.fromArray( value );

                                                }

                                            } else {

                                                if ( shaderParam && shaderParam.value ) {

                                                    var m4 = shaderParam.value;
                                                    uvalue.fromArray( m4 );

                                                }

                                                if ( value ) {

                                                    uvalue.fromArray( value );

                                                }

                                            }

                                            break;

                                        case WEBGL_CONSTANTS.SAMPLER_2D:

                                            if ( value !== undefined ) {

                                                uvalue = dependencies.textures[ value ];

                                            } else if ( shaderParam.value !== undefined ) {

                                                uvalue = dependencies.textures[ shaderParam.value ];

                                            } else {

                                                uvalue = null;

                                            }

                                            break;

                                    }

                                    materialParams.uniforms[ uniformId ] = {
                                        value: uvalue,
                                        semantic: usemantic,
                                        node: unode
                                    };

                                } else {

                                    throw new Error( "Unknown shader uniform param type: " + ptype );

                                }

                            }

                            var states = technique.states || {};
                            var enables = states.enable || [];
                            var functions = states.functions || {};

                            var enableCullFace = false;
                            var enableDepthTest = false;
                            var enableBlend = false;

                            for ( var i = 0, il = enables.length; i < il; i ++ ) {

                                var enable = enables[ i ];

                                switch ( STATES_ENABLES[ enable ] ) {

                                    case 'CULL_FACE':

                                        enableCullFace = true;

                                        break;

                                    case 'DEPTH_TEST':

                                        enableDepthTest = true;

                                        break;

                                    case 'BLEND':

                                        enableBlend = true;

                                        break;

                                    // TODO: implement
                                    case 'SCISSOR_TEST':
                                    case 'POLYGON_OFFSET_FILL':
                                    case 'SAMPLE_ALPHA_TO_COVERAGE':

                                        break;

                                    default:

                                        throw new Error( "Unknown technique.states.enable: " + enable );

                                }

                            }

                            if ( enableCullFace ) {

                                materialParams.side = functions.cullFace !== undefined ? WEBGL_SIDES[ functions.cullFace ] : THREE.FrontSide;

                            } else {

                                materialParams.side = THREE.DoubleSide;

                            }

                            materialParams.depthTest = enableDepthTest;
                            materialParams.depthFunc = functions.depthFunc !== undefined ? WEBGL_DEPTH_FUNCS[ functions.depthFunc ] : THREE.LessDepth;
                            materialParams.depthWrite = functions.depthMask !== undefined ? functions.depthMask[ 0 ] : true;

                            materialParams.blending = enableBlend ? THREE.CustomBlending : THREE.NoBlending;
                            materialParams.transparent = enableBlend;

                            var blendEquationSeparate = functions.blendEquationSeparate;

                            if ( blendEquationSeparate !== undefined ) {

                                materialParams.blendEquation = WEBGL_BLEND_EQUATIONS[ blendEquationSeparate[ 0 ] ];
                                materialParams.blendEquationAlpha = WEBGL_BLEND_EQUATIONS[ blendEquationSeparate[ 1 ] ];

                            } else {

                                materialParams.blendEquation = THREE.AddEquation;
                                materialParams.blendEquationAlpha = THREE.AddEquation;

                            }

                            var blendFuncSeparate = functions.blendFuncSeparate;

                            if ( blendFuncSeparate !== undefined ) {

                                materialParams.blendSrc = WEBGL_BLEND_FUNCS[ blendFuncSeparate[ 0 ] ];
                                materialParams.blendDst = WEBGL_BLEND_FUNCS[ blendFuncSeparate[ 1 ] ];
                                materialParams.blendSrcAlpha = WEBGL_BLEND_FUNCS[ blendFuncSeparate[ 2 ] ];
                                materialParams.blendDstAlpha = WEBGL_BLEND_FUNCS[ blendFuncSeparate[ 3 ] ];

                            } else {

                                materialParams.blendSrc = THREE.OneFactor;
                                materialParams.blendDst = THREE.ZeroFactor;
                                materialParams.blendSrcAlpha = THREE.OneFactor;
                                materialParams.blendDstAlpha = THREE.ZeroFactor;

                            }

                        }
                    }
                }

                if ( Array.isArray( materialValues.diffuse ) ) {

                    materialParams.color = new THREE.Color().fromArray( materialValues.diffuse );

                } else if ( typeof ( materialValues.diffuse ) === 'string' ) {

                    materialParams.map = dependencies.textures[ materialValues.diffuse ];

                }

                delete materialParams.diffuse;

                if ( typeof ( materialValues.reflective ) === 'string' ) {

                    materialParams.envMap = dependencies.textures[ materialValues.reflective ];

                }

                if ( typeof ( materialValues.bump ) === 'string' ) {

                    materialParams.bumpMap = dependencies.textures[ materialValues.bump ];

                }

                if ( Array.isArray( materialValues.emission ) ) {

                    if ( materialType === THREE.MeshBasicMaterial ) {

                        materialParams.color = new THREE.Color().fromArray( materialValues.emission );

                    } else {

                        materialParams.emissive = new THREE.Color().fromArray( materialValues.emission );

                    }

                } else if ( typeof ( materialValues.emission ) === 'string' ) {

                    if ( materialType === THREE.MeshBasicMaterial ) {

                        materialParams.map = dependencies.textures[ materialValues.emission ];

                    } else {

                        materialParams.emissiveMap = dependencies.textures[ materialValues.emission ];

                    }

                }

                if ( Array.isArray( materialValues.specular ) ) {

                    materialParams.specular = new THREE.Color().fromArray( materialValues.specular );

                } else if ( typeof ( materialValues.specular ) === 'string' ) {

                    materialParams.specularMap = dependencies.textures[ materialValues.specular ];

                }

                if ( materialValues.shininess !== undefined ) {

                    materialParams.shininess = materialValues.shininess;

                }

                var _material = new materialType( materialParams );
                if ( material.name !== undefined ) _material.name = material.name;

                return _material;

            } );

        } );

    };

    GLTFParser.prototype.loadMeshes = function () {

        var json = this.json;

        return this._withDependencies( [

            "accessors",
            "materials"

        ] ).then( function ( dependencies ) {

            return _each( json.meshes, function ( mesh ) {

                var group = new THREE.Group();
                if ( mesh.name !== undefined ) group.name = mesh.name;

                if ( mesh.extras ) group.userData = mesh.extras;

                var primitives = mesh.primitives || [];

                for ( var name in primitives ) {

                    var primitive = primitives[ name ];

                    if ( primitive.mode === WEBGL_CONSTANTS.TRIANGLES || primitive.mode === undefined ) {

                        var geometry = new THREE.BufferGeometry();

                        var attributes = primitive.attributes;

                        for ( var attributeId in attributes ) {

                            var attributeEntry = attributes[ attributeId ];

                            if ( ! attributeEntry ) return;

                            var bufferAttribute = dependencies.accessors[ attributeEntry ];

                            switch ( attributeId ) {

                                case 'POSITION':
                                    geometry.setAttribute( 'position', bufferAttribute );
                                    break;

                                case 'NORMAL':
                                    geometry.setAttribute( 'normal', bufferAttribute );
                                    break;

                                case 'TEXCOORD_0':
                                case 'TEXCOORD0':
                                case 'TEXCOORD':
                                    geometry.setAttribute( 'uv', bufferAttribute );
                                    break;

                                case 'TEXCOORD_1':
                                    geometry.setAttribute( 'uv2', bufferAttribute );
                                    break;

                                case 'COLOR_0':
                                case 'COLOR0':
                                case 'COLOR':
                                    geometry.setAttribute( 'color', bufferAttribute );
                                    break;

                                case 'WEIGHT':
                                    geometry.setAttribute( 'skinWeight', bufferAttribute );
                                    break;

                                case 'JOINT':
                                    geometry.setAttribute( 'skinIndex', bufferAttribute );
                                    break;

                                default:

                                    if ( ! primitive.material ) break;

                                    var material = json.materials[ primitive.material ];

                                    if ( ! material.technique ) break;

                                    var parameters = json.techniques[ material.technique ].parameters || {};

                                    for ( var attributeName in parameters ) {

                                        if ( parameters[ attributeName ][ 'semantic' ] === attributeId ) {

                                            geometry.setAttribute( attributeName, bufferAttribute );

                                        }

                                    }

                            }

                        }

                        if ( primitive.indices ) {

                            geometry.setIndex( dependencies.accessors[ primitive.indices ] );

                        }

                        var material = dependencies.materials !== undefined ? dependencies.materials[ primitive.material ] : createDefaultMaterial();

                        var meshNode = new THREE.Mesh( geometry, material );
                        meshNode.castShadow = true;
                        meshNode.name = ( name === "0" ? group.name : group.name + name );

                        if ( primitive.extras ) meshNode.userData = primitive.extras;

                        group.add( meshNode );

                    } else if ( primitive.mode === WEBGL_CONSTANTS.LINES ) {

                        var geometry = new THREE.BufferGeometry();

                        var attributes = primitive.attributes;

                        for ( var attributeId in attributes ) {

                            var attributeEntry = attributes[ attributeId ];

                            if ( ! attributeEntry ) return;

                            var bufferAttribute = dependencies.accessors[ attributeEntry ];

                            switch ( attributeId ) {

                                case 'POSITION':
                                    geometry.setAttribute( 'position', bufferAttribute );
                                    break;

                                case 'COLOR_0':
                                case 'COLOR0':
                                case 'COLOR':
                                    geometry.setAttribute( 'color', bufferAttribute );
                                    break;

                            }

                        }

                        var material = dependencies.materials[ primitive.material ];

                        var meshNode;

                        if ( primitive.indices ) {

                            geometry.setIndex( dependencies.accessors[ primitive.indices ] );

                            meshNode = new THREE.LineSegments( geometry, material );

                        } else {

                            meshNode = new THREE.Line( geometry, material );

                        }

                        meshNode.name = ( name === "0" ? group.name : group.name + name );

                        if ( primitive.extras ) meshNode.userData = primitive.extras;

                        group.add( meshNode );

                    } else {

                        console.warn( "Only triangular and line primitives are supported" );

                    }

                }

                return group;

            } );

        } );

    };

    GLTFParser.prototype.loadCameras = function () {

        var json = this.json;

        return _each( json.cameras, function ( camera ) {

            if ( camera.type == "perspective" && camera.perspective ) {

                var yfov = camera.perspective.yfov;
                var aspectRatio = camera.perspective.aspectRatio !== undefined ? camera.perspective.aspectRatio : 1;

                // According to COLLADA spec...
                // aspectRatio = xfov / yfov
                var xfov = yfov * aspectRatio;

                var _camera = new THREE.PerspectiveCamera( THREE.MathUtils.radToDeg( xfov ), aspectRatio, camera.perspective.znear || 1, camera.perspective.zfar || 2e6 );
                if ( camera.name !== undefined ) _camera.name = camera.name;

                if ( camera.extras ) _camera.userData = camera.extras;

                return _camera;

            } else if ( camera.type == "orthographic" && camera.orthographic ) {

                var _camera = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2, window.innerHeight / 2, window.innerHeight / - 2, camera.orthographic.znear, camera.orthographic.zfar );
                if ( camera.name !== undefined ) _camera.name = camera.name;

                if ( camera.extras ) _camera.userData = camera.extras;

                return _camera;

            }

        } );

    };

    GLTFParser.prototype.loadSkins = function () {

        var json = this.json;

        return this._withDependencies( [

            "accessors"

        ] ).then( function ( dependencies ) {

            return _each( json.skins, function ( skin ) {

                var bindShapeMatrix = new THREE.Matrix4();

                if ( skin.bindShapeMatrix !== undefined ) bindShapeMatrix.fromArray( skin.bindShapeMatrix );

                var _skin = {
                    bindShapeMatrix: bindShapeMatrix,
                    jointNames: skin.jointNames,
                    inverseBindMatrices: dependencies.accessors[ skin.inverseBindMatrices ]
                };

                return _skin;

            } );

        } );

    };

    GLTFParser.prototype.loadAnimations = function () {

        var json = this.json;

        return this._withDependencies( [

            "accessors",
            "nodes"

        ] ).then( function ( dependencies ) {

            return _each( json.animations, function ( animation, animationId ) {

                var tracks = [];

                for ( var channelId in animation.channels ) {

                    var channel = animation.channels[ channelId ];
                    var sampler = animation.samplers[ channel.sampler ];

                    if ( sampler ) {

                        var target = channel.target;
                        var name = target.id;
                        var input = animation.parameters !== undefined ? animation.parameters[ sampler.input ] : sampler.input;
                        var output = animation.parameters !== undefined ? animation.parameters[ sampler.output ] : sampler.output;

                        var inputAccessor = dependencies.accessors[ input ];
                        var outputAccessor = dependencies.accessors[ output ];

                        var node = dependencies.nodes[ name ];

                        if ( node ) {

                            node.updateMatrix();
                            node.matrixAutoUpdate = true;

                            var TypedKeyframeTrack = PATH_PROPERTIES[ target.path ] === PATH_PROPERTIES.rotation
                                ? THREE.QuaternionKeyframeTrack
                                : THREE.VectorKeyframeTrack;

                            var targetName = node.name ? node.name : node.uuid;
                            var interpolation = sampler.interpolation !== undefined ? INTERPOLATION[ sampler.interpolation ] : THREE.InterpolateLinear;

                            // KeyframeTrack.optimize() will modify given 'times' and 'values'
                            // buffers before creating a truncated copy to keep. Because buffers may
                            // be reused by other tracks, make copies here.
                            tracks.push( new TypedKeyframeTrack(
                                targetName + '.' + PATH_PROPERTIES[ target.path ],
                                inputAccessor.array.slice(),
                                outputAccessor.array.slice(),
                                interpolation
                            ) );

                        }

                    }

                }

                var name = animation.name !== undefined ? animation.name : "animation_" + animationId;

                return new THREE.AnimationClip( name, undefined, tracks );

            } );

        } );

    };

    GLTFParser.prototype.loadNodes = function () {

        var json = this.json;
        var extensions = this.extensions;
        var scope = this;

        return _each( json.nodes, function ( node ) {

            var matrix = new THREE.Matrix4();

            var _node;

            if ( node.jointName ) {

                _node = new THREE.Bone();
                _node.name = node.name !== undefined ? node.name : node.jointName;
                _node.jointName = node.jointName;

            } else {

                _node = new THREE.Object3D();
                if ( node.name !== undefined ) _node.name = node.name;

            }

            if ( node.extras ) _node.userData = node.extras;

            if ( node.matrix !== undefined ) {

                matrix.fromArray( node.matrix );
                _node.applyMatrix4( matrix );

            } else {

                if ( node.translation !== undefined ) {

                    _node.position.fromArray( node.translation );

                }

                if ( node.rotation !== undefined ) {

                    _node.quaternion.fromArray( node.rotation );

                }

                if ( node.scale !== undefined ) {

                    _node.scale.fromArray( node.scale );

                }

            }

            return _node;

        } ).then( function ( __nodes ) {

            return scope._withDependencies( [

                "meshes",
                "skins",
                "cameras"

            ] ).then( function ( dependencies ) {

                return _each( __nodes, function ( _node, nodeId ) {

                    var node = json.nodes[ nodeId ];

                    if ( node.meshes !== undefined ) {

                        for ( var meshId in node.meshes ) {

                            var mesh = node.meshes[ meshId ];
                            var group = dependencies.meshes[ mesh ];

                            if ( group === undefined ) {

                                console.warn( 'LegacyGLTFLoader: Couldn\'t find node "' + mesh + '".' );
                                continue;

                            }

                            for ( var childrenId in group.children ) {

                                var child = group.children[ childrenId ];

                                // clone Mesh to add to _node

                                var originalMaterial = child.material;
                                var originalGeometry = child.geometry;
                                var originalUserData = child.userData;
                                var originalName = child.name;

                                var material;

                                if ( originalMaterial.isDeferredShaderMaterial ) {

                                    originalMaterial = material = originalMaterial.create();

                                } else {

                                    material = originalMaterial;

                                }

                                switch ( child.type ) {

                                    case 'LineSegments':
                                        child = new THREE.LineSegments( originalGeometry, material );
                                        break;

                                    case 'LineLoop':
                                        child = new THREE.LineLoop( originalGeometry, material );
                                        break;

                                    case 'Line':
                                        child = new THREE.Line( originalGeometry, material );
                                        break;

                                    default:
                                        child = new THREE.Mesh( originalGeometry, material );

                                }

                                child.castShadow = true;
                                child.userData = originalUserData;
                                child.name = originalName;

                                var skinEntry;

                                if ( node.skin ) {

                                    skinEntry = dependencies.skins[ node.skin ];

                                }

                                // Replace Mesh with SkinnedMesh in library
                                if ( skinEntry ) {

                                    var getJointNode = function ( jointId ) {

                                        var keys = Object.keys( __nodes );

                                        for ( var i = 0, il = keys.length; i < il; i ++ ) {

                                            var n = __nodes[ keys[ i ] ];

                                            if ( n.jointName === jointId ) return n;

                                        }

                                        return null;

                                    };

                                    var geometry = originalGeometry;
                                    var material = originalMaterial;
                                    material.skinning = true;

                                    child = new THREE.SkinnedMesh( geometry, material );
                                    child.castShadow = true;
                                    child.userData = originalUserData;
                                    child.name = originalName;

                                    var bones = [];
                                    var boneInverses = [];

                                    for ( var i = 0, l = skinEntry.jointNames.length; i < l; i ++ ) {

                                        var jointId = skinEntry.jointNames[ i ];
                                        var jointNode = getJointNode( jointId );

                                        if ( jointNode ) {

                                            bones.push( jointNode );

                                            var m = skinEntry.inverseBindMatrices.array;
                                            var mat = new THREE.Matrix4().fromArray( m, i * 16 );
                                            boneInverses.push( mat );

                                        } else {

                                            console.warn( "WARNING: joint: '" + jointId + "' could not be found" );

                                        }

                                    }

                                    child.bind( new THREE.Skeleton( bones, boneInverses ), skinEntry.bindShapeMatrix );

                                    var buildBoneGraph = function ( parentJson, parentObject, property ) {

                                        var children = parentJson[ property ];

                                        if ( children === undefined ) return;

                                        for ( var i = 0, il = children.length; i < il; i ++ ) {

                                            var nodeId = children[ i ];
                                            var bone = __nodes[ nodeId ];
                                            var boneJson = json.nodes[ nodeId ];

                                            if ( bone !== undefined && bone.isBone === true && boneJson !== undefined ) {

                                                parentObject.add( bone );
                                                buildBoneGraph( boneJson, bone, 'children' );

                                            }

                                        }

                                    };

                                    buildBoneGraph( node, child, 'skeletons' );

                                }

                                _node.add( child );

                            }

                        }

                    }

                    if ( node.camera !== undefined ) {

                        var camera = dependencies.cameras[ node.camera ];

                        _node.add( camera );

                    }

                    if ( node.extensions
                        && node.extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ]
                        && node.extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ].light ) {

                        var extensionLights = extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ].lights;
                        var light = extensionLights[ node.extensions[ EXTENSIONS.KHR_MATERIALS_COMMON ].light ];

                        _node.add( light );

                    }

                    return _node;

                } );

            } );

        } );

    };

    GLTFParser.prototype.loadScenes = function () {

        var json = this.json;
        var extensions = this.extensions;

        // scene node hierachy builder

        function buildNodeHierachy( nodeId, parentObject, allNodes ) {

            var _node = allNodes[ nodeId ];
            parentObject.add( _node );

            var node = json.nodes[ nodeId ];

            if ( node.children ) {

                var children = node.children;

                for ( var i = 0, l = children.length; i < l; i ++ ) {

                    var child = children[ i ];
                    buildNodeHierachy( child, _node, allNodes );

                }

            }

        }

        return this._withDependencies( [

            "nodes"

        ] ).then( function ( dependencies ) {

            return _each( json.scenes, function ( scene ) {

                var _scene = new THREE.Scene();
                if ( scene.name !== undefined ) _scene.name = scene.name;

                if ( scene.extras ) _scene.userData = scene.extras;

                var nodes = scene.nodes || [];

                for ( var i = 0, l = nodes.length; i < l; i ++ ) {

                    var nodeId = nodes[ i ];
                    buildNodeHierachy( nodeId, _scene, dependencies.nodes );

                }

                _scene.traverse( function ( child ) {

                    // Register raw material meshes with LegacyGLTFLoader.Shaders
                    if ( child.material && child.material.isRawShaderMaterial ) {

                        child.gltfShader = new GLTFShader( child, dependencies.nodes );
                        child.onBeforeRender = function ( renderer, scene, camera ) {

                            this.gltfShader.update( scene, camera );

                        };

                    }

                } );

                if ( extensions[ EXTENSIONS.CESIUM_RTC ] ) {
                    _scene.position.fromArray(extensions[ EXTENSIONS.CESIUM_RTC ].center);
                }
                return _scene;

            } );

        } );

    };

    return LegacyGLTFLoader;

} )();

export default threeExamples.LegacyGLTFLoader;
